/*!
 xCharts v0.3.0 Copyright (c) 2012, tenXer, Inc. All Rights Reserved.
 @license MIT license. http://github.com/tenXer/xcharts for details
 */

(function () {

    var xChart,
        _vis = {},
        _scales = {},
        _visutils = {};
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        return _.chain(_.range(zIndex, 10)).reverse().map(function (z) {
            return 'g[data-index="' + z + '"]';
        }).value().join(', ');
    }

    function colorClass(el, i) {
        var c = el.getAttribute('class');
        return ((c !== null) ? c.replace(/color\d+/g, '') : '') + ' color' + i;
    }

    _visutils = {
        getInsertionPoint: getInsertionPoint,
        colorClass: colorClass
    };
    var local = this,
        defaultSpacing = 0.25;

    function _getDomain(data, axis) {
        return _.chain(data)
            .pluck('data')
            .flatten()
            .pluck(axis)
            .uniq()
            .filter(function (d) {
                return d !== undefined && d !== null;
            })
            .value()
            .sort(d3.ascending);
    }

    _scales.ordinal = function (data, axis, bounds, extents) {
        var domain = _getDomain(data, axis);
        return d3.scale.ordinal()
            .domain(domain)
            .rangeRoundBands(bounds, defaultSpacing);
    };

    _scales.linear = function (data, axis, bounds, extents) {
        return d3.scale.linear()
            .domain(extents)
            .nice()
            .rangeRound(bounds);
    };

    _scales.exponential = function (data, axis, bounds, extents) {
        return d3.scale.pow()
            .exponent(0.65)
            .domain(extents)
            .nice()
            .rangeRound(bounds);
    };

    _scales.time = function (data, axis, bounds, extents) {
        return d3.time.scale()
            .domain(_.map(extents, function (d) { return new Date(d); }))
            .range(bounds);
    };

    function _extendDomain(domain, axis) {
        var min = domain[0],
            max = domain[1],
            diff,
            e;

        if (min === max) {
            e = Math.max(Math.round(min / 10), 4);
            min -= e;
            max += e;
        }

        diff = max - min;
        min = (min) ? min - (diff / 10) : min;
        min = (domain[0] > 0) ? Math.max(min, 0) : min;
        max = (max) ? max + (diff / 10) : max;
        max = (domain[1] < 0) ? Math.min(max, 0) : max;

        return [min, max];
    }

    function _getExtents(options, data, xType, yType) {
        var extents,
            nData = _.chain(data)
                .pluck('data')
                .flatten()
                .value();

        extents = {
            x: d3.extent(nData, function (d) { return d.x; }),
            y: d3.extent(nData, function (d) { return d.y; })
        };

        _.each([xType, yType], function (type, i) {
            var axis = (i) ? 'y' : 'x',
                extended;
            extents[axis] = d3.extent(nData, function (d) { return d[axis]; });
            if (type === 'ordinal') {
                return;
            }

            _.each([axis + 'Min', axis + 'Max'], function (minMax, i) {
                if (type !== 'time') {
                    extended = _extendDomain(extents[axis]);
                }

                if (options.hasOwnProperty(minMax) && options[minMax] !== null) {
                    extents[axis][i] = options[minMax];
                } else if (type !== 'time') {
                    extents[axis][i] = extended[i];
                }
            });
        });

        return extents;
    }

    _scales.xy = function (self, data, xType, yType) {
        var o = self._options,
            extents = _getExtents(o, data, xType, yType),
            scales = {},
            horiz = [o.axisPaddingLeft, self._width],
            vert = [self._height, o.axisPaddingTop],
            xScale,
            yScale;

        _.each([xType, yType], function (type, i) {
            var axis = (i === 0) ? 'x' : 'y',
                bounds = (i === 0) ? horiz : vert,
                fn = xChart.getScale(type);
            scales[axis] = fn(data, axis, bounds, extents[axis]);
        });

        return scales;
    };
    (function () {
        var zIndex = 2,
            selector = 'g.bar',
            insertBefore = _visutils.getInsertionPoint(zIndex);

        function postUpdateScale(self, scaleData, mainData, compData) {
            self.xScale2 = d3.scale.ordinal()
                .domain(d3.range(0, mainData.length))
                .rangeRoundBands([0, self.xScale.rangeBand()], 0.08);
        }

        function enter(self, storage, className, data, callbacks) {
            var barGroups, bars,
                yZero = self.yZero;

            barGroups = self._g.selectAll(selector + className)
                .data(data, function (d) {
                    return d.className;
                });

            barGroups.enter().insert('g', insertBefore)
                .attr('data-index', zIndex)
                .style('opacity', 0)
                .attr('class', function (d, i) {
                    var cl = _.uniq((className + d.className).split('.')).join(' ');
                    return cl + ' bar ' + _visutils.colorClass(this, i);
                })
                .attr('transform', function (d, i) {
                    return 'translate(' + self.xScale2(i) + ',0)';
                });

            bars = barGroups.selectAll('rect')
                .data(function (d) {
                    return d.data;
                }, function (d) {
                    return d.x;
                });

            bars.enter().append('rect')
                .attr('width', 0)
                .attr('rx', 3)
                .attr('ry', 3)
                .attr('x', function (d) {
                    return self.xScale(d.x) + (self.xScale2.rangeBand() / 2);
                })
                .attr('height', function (d) {
                    return Math.abs(yZero - self.yScale(d.y));
                })
                .attr('y', function (d) {
                    return (d.y < 0) ? yZero : self.yScale(d.y);
                })
                .on('mouseover', callbacks.mouseover)
                .on('mouseout', callbacks.mouseout)
                .on('click', callbacks.click);

            storage.barGroups = barGroups;
            storage.bars = bars;
        }

        function update(self, storage, timing) {
            var yZero = self.yZero;

            storage.barGroups
                .attr('class', function (d, i) {
                    return _visutils.colorClass(this, i);
                })
                .transition().duration(timing)
                .style('opacity', 1)
                .attr('transform', function (d, i) {
                    return 'translate(' + self.xScale2(i) + ',0)';
                });

            storage.bars.transition().duration(timing)
                .attr('width', self.xScale2.rangeBand())
                .attr('x', function (d) {
                    return self.xScale(d.x);
                })
                .attr('height', function (d) {
                    return Math.abs(yZero - self.yScale(d.y));
                })
                .attr('y', function (d) {
                    return (d.y < 0) ? yZero : self.yScale(d.y);
                });
        }

        function exit(self, storage, timing) {
            storage.bars.exit()
                .transition().duration(timing)
                .attr('width', 0)
                .remove();
            storage.barGroups.exit()
                .transition().duration(timing)
                .style('opacity', 0)
                .remove();
        }

        function destroy(self, storage, timing) {
            var band = (self.xScale2) ? self.xScale2.rangeBand() / 2 : 0;
            delete self.xScale2;
            storage.bars
                .transition().duration(timing)
                .attr('width', 0)
                .attr('x', function (d) {
                    return self.xScale(d.x) + band;
                });
        }

        _vis.bar = {
            postUpdateScale: postUpdateScale,
            enter: enter,
            update: update,
            exit: exit,
            destroy: destroy
        };
    }());
    (function () {

        var zIndex = 3,
            selector = 'g.line',
            insertBefore = _visutils.getInsertionPoint(zIndex);

        function enter(self, storage, className, data, callbacks) {
            var inter = self._options.interpolation,
                x = function (d, i) {
                    if (!self.xScale2 && !self.xScale.rangeBand) {
                        return self.xScale(d.x);
                    }
                    return self.xScale(d.x) + (self.xScale.rangeBand() / 2);
                },
                y = function (d) { return self.yScale(d.y); },
                line = d3.svg.line()
                    .x(x)
                    .interpolate(inter),
                area = d3.svg.area()
                    .x(x)
                    .y1(self.yZero)
                    .interpolate(inter),
                container,
                fills,
                paths;

            function datum(d) {
                return [d.data];
            }

            container = self._g.selectAll(selector + className)
                .data(data, function (d) {
                    return d.className;
                });

            container.enter().insert('g', insertBefore)
                .attr('data-index', zIndex)
                .attr('class', function (d, i) {
                    var cl = _.uniq((className + d.className).split('.')).join(' ');
                    return cl + ' line ' + _visutils.colorClass(this, i);
                });

            fills = container.selectAll('path.fill')
                .data(datum);

            fills.enter().append('path')
                .attr('class', 'fill')
                .style('opacity', 0)
                .attr('d', area.y0(y));

            paths = container.selectAll('path.line')
                .data(datum);

            paths.enter().append('path')
                .attr('class', 'line')
                .style('opacity', 0)
                .attr('d', line.y(y));

            storage.lineContainers = container;
            storage.lineFills = fills;
            storage.linePaths = paths;
            storage.lineX = x;
            storage.lineY = y;
            storage.lineA = area;
            storage.line = line;
        }

        function update(self, storage, timing) {
            storage.lineContainers
                .attr('class', function (d, i) {
                    return _visutils.colorClass(this, i);
                });

            storage.lineFills.transition().duration(timing)
                .style('opacity', 1)
                .attr('d', storage.lineA.y0(storage.lineY));

            storage.linePaths.transition().duration(timing)
                .style('opacity', 1)
                .attr('d', storage.line.y(storage.lineY));
        }

        function exit(self, storage) {
            storage.linePaths.exit()
                .style('opacity', 0)
                .remove();
            storage.lineFills.exit()
                .style('opacity', 0)
                .remove();

            storage.lineContainers.exit()
                .remove();
        }

        function destroy(self, storage, timing) {
            storage.linePaths.transition().duration(timing)
                .style('opacity', 0);
            storage.lineFills.transition().duration(timing)
                .style('opacity', 0);
        }

        _vis.line = {
            enter: enter,
            update: update,
            exit: exit,
            destroy: destroy
        };
    }());
    (function () {
        var line = _vis.line;

        function enter(self, storage, className, data, callbacks) {
            var circles;

            line.enter(self, storage, className, data, callbacks);

            circles = storage.lineContainers.selectAll('circle')
                .data(function (d) {
                    return d.data;
                }, function (d) {
                    return d.x;
                });

            circles.enter().append('circle')
                .style('opacity', 0)
                .attr('cx', storage.lineX)
                .attr('cy', storage.lineY)
                .attr('r', 5)
                .on('mouseover', callbacks.mouseover)
                .on('mouseout', callbacks.mouseout)
                .on('click', callbacks.click);

            storage.lineCircles = circles;
        }

        function update(self, storage, timing) {
            line.update.apply(null, _.toArray(arguments));

            storage.lineCircles.transition().duration(timing)
                .style('opacity', 1)
                .attr('cx', storage.lineX)
                .attr('cy', storage.lineY);
        }

        function exit(self, storage) {
            storage.lineCircles.exit()
                .remove();
            line.exit.apply(null, _.toArray(arguments));
        }

        function destroy(self, storage, timing) {
            line.destroy.apply(null, _.toArray(arguments));
            if (!storage.lineCircles) {
                return;
            }
            storage.lineCircles.transition().duration(timing)
                .style('opacity', 0);
        }

        _vis['line-dotted'] = {
            enter: enter,
            update: update,
            exit: exit,
            destroy: destroy
        };
    }());
    (function () {
        var line = _vis['line-dotted'];

        function enter(self, storage, className, data, callbacks) {
            line.enter(self, storage, className, data, callbacks);
        }

        function _accumulate_data(data) {
            function reduce(memo, num) {
                return memo + num.y;
            }

            var nData = _.map(data, function (set) {
                var i = set.data.length,
                    d = _.clone(set.data);
                set = _.clone(set);
                while (i) {
                    i -= 1;
                    // Need to clone here, otherwise we are actually setting the same
                    // data onto the original data set.
                    d[i] = _.clone(set.data[i]);
                    d[i].y0 = set.data[i].y;
                    d[i].y = _.reduce(_.first(set.data, i), reduce, set.data[i].y);
                }
                return _.extend(set, { data: d });
            });

            return nData;
        }

        function _resetData(self) {
            if (!self.hasOwnProperty('cumulativeOMainData')) {
                return;
            }
            self._mainData = self.cumulativeOMainData;
            delete self.cumulativeOMainData;
            self._compData = self.cumulativeOCompData;
            delete self.cumulativeOCompData;
        }

        function preUpdateScale(self, data) {
            _resetData(self);
            self.cumulativeOMainData = self._mainData;
            self._mainData = _accumulate_data(self._mainData);
            self.cumulativeOCompData = self._compData;
            self._compData = _accumulate_data(self._compData);
        }

        function destroy(self, storage, timing) {
            _resetData(self);
            line.destroy.apply(null, _.toArray(arguments));
        }

        _vis.cumulative = {
            preUpdateScale: preUpdateScale,
            enter: enter,
            update: line.update,
            exit: line.exit,
            destroy: destroy
        };
    }());
    var emptyData = [[]],
        defaults = {
            // User interaction callbacks
            mouseover: function (data, i) {},
            mouseout: function (data, i) {},
            click: function (data, i) {},

            // Padding between the axes and the contents of the chart
            axisPaddingTop: 0,
            axisPaddingRight: 0,
            axisPaddingBottom: 5,
            axisPaddingLeft: 20,

            // Padding around the edge of the chart (space for axis labels, etc)
            paddingTop: 0,
            paddingRight: 0,
            paddingBottom: 20,
            paddingLeft: 60,

            // Axis tick formatting
            tickHintX: 10,
            tickFormatX: function (x) { return x; },
            tickHintY: 10,
            tickFormatY: function (y) { return y; },

            // Min/Max Axis Values
            xMin: null,
            xMax: null,
            yMin: null,
            yMax: null,

            // Pre-format input data
            dataFormatX: function (x) { return x; },
            dataFormatY: function (y) { return y; },

            unsupported: function (selector) {
                d3.select(selector).text('SVG is not supported on your browser');
            },

            // Callback functions if no data
            empty: function (self, selector, d) {},
            notempty: function (self, selector) {},

            timing: 750,

            // Line interpolation
            interpolation: 'monotone',

            // Data sorting
            sortX: function (a, b) {
                return (!a.x && !b.x) ? 0 : (a.x < b.x) ? -1 : 1;
            }
        };

// What/how should the warning/error be presented?
    function svgEnabled() {
        var d = document;
        return (!!d.createElementNS &&
        !!d.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect);
    }

    /**
     * Creates a new chart
     *
     * @param string type       The drawing type for the main data
     * @param array data        Data to render in the chart
     * @param string selector   CSS Selector for the parent element for the chart
     * @param object options    Optional. See `defaults` for options
     *
     * Examples:
     *    var data = {
 *        "main": [
 *          {
 *            "data": [
 *              {
 *                "x": "2012-08-09T07:00:00.522Z",
 *                "y": 68
 *              },
 *              {
 *                "x": "2012-08-10T07:00:00.522Z",
 *                "y": 295
 *              },
 *              {
 *                "x": "2012-08-11T07:00:00.522Z",
 *                "y": 339
 *              },
 *            ],
 *            "className": ".foo"
 *          }
 *        ],
 *        "xScale": "ordinal",
 *        "yScale": "linear",
 *        "comp": [
 *          {
 *            "data": [
 *              {
 *                "x": "2012-08-09T07:00:00.522Z",
 *                "y": 288
 *              },
 *              {
 *                "x": "2012-08-10T07:00:00.522Z",
 *                "y": 407
 *              },
 *              {
 *                "x": "2012-08-11T07:00:00.522Z",
 *                "y": 459
 *              }
 *            ],
 *            "className": ".comp.comp_foo",
 *            "type": "line-arrowed"
 *          }
 *        ]
 *      },
     *      myChart = new Chart('bar', data, '#chart');
     *
     */
    function xChart(type, data, selector, options) {
        var self = this,
            resizeLock;

        self._options = options = _.defaults(options || {}, defaults);

        if (svgEnabled() === false) {
            return options.unsupported(selector);
        }

        self._selector = selector;
        self._container = d3.select(selector);
        self._drawSvg();
        self._mainStorage = {};
        self._compStorage = {};

        data = _.clone(data);
        if (type && !data.type) {
            data.type = type;
        }

        self.setData(data);

        d3.select(window).on('resize.for.' + selector, function () {
            if (resizeLock) {
                clearTimeout(resizeLock);
            }
            resizeLock = setTimeout(function () {
                resizeLock = null;
                self._resize();
            }, 500);
        });
    }

    /**
     * Add a visualization type
     *
     * @param string type   Unique key/name used with setType
     * @param object vis    object map of vis methods
     */
    xChart.setVis = function (type, vis) {
        if (_vis.hasOwnProperty(type)) {
            throw 'Cannot override vis type "' + type + '".';
        }
        _vis[type] = vis;
    };

    /**
     * Get a clone of a visualization
     * Useful for extending vis functionality
     *
     * @param string type   Unique key/name of the vis
     */
    xChart.getVis = function (type) {
        if (!_vis.hasOwnProperty(type)) {
            throw 'Vis type "' + type + '" does not exist.';
        }

        return _.clone(_vis[type]);
    };

    xChart.setScale = function (name, fn) {
        if (_scales.hasOwnProperty(name)) {
            throw 'Scale type "' + name + '" already exists.';
        }

        _scales[name] = fn;
    };

    xChart.getScale = function (name) {
        if (!_scales.hasOwnProperty(name)) {
            throw 'Scale type "' + name + '" does not exist.';
        }
        return _scales[name];
    };

    xChart.visutils = _visutils;

    _.defaults(xChart.prototype, {
        /**
         * Set or change the drawing type for the main data.
         *
         * @param string type   Must be an available drawing type
         *
         */
        setType: function (type, skipDraw) {
            var self = this;

            if (self._type && type === self._type) {
                return;
            }

            if (!_vis.hasOwnProperty(type)) {
                throw 'Vis type "' + type + '" is not defined.';
            }

            if (self._type) {
                self._destroy(self._vis, self._mainStorage);
            }

            self._type = type;
            self._vis = _vis[type];
            if (!skipDraw) {
                self._draw();
            }
        },

        /**
         * Set and update the data for the chart. Optionally skip drawing.
         *
         * @param object data       New data. See new xChart example for format
         *
         */
        setData: function (data) {
            var self = this,
                o = self._options,
                nData = _.clone(data);

            if (!data.hasOwnProperty('main')) {
                throw 'No "main" key found in given chart data.';
            }

            switch (data.type) {
                case 'bar':
                    // force the xScale to be ordinal
                    data.xScale = 'ordinal';
                    break;
                case undefined:
                    data.type = self._type;
                    break;
            }

            o.xMin = (isNaN(parseInt(data.xMin, 10))) ? o.xMin : data.xMin;
            o.xMax = (isNaN(parseInt(data.xMax, 10))) ? o.xMax : data.xMax;
            o.yMin = (isNaN(parseInt(data.yMin, 10))) ? o.yMin : data.yMin;
            o.yMax = (isNaN(parseInt(data.yMax, 10))) ? o.yMax : data.yMax;

            if (self._vis) {
                self._destroy(self._vis, self._mainStorage);
            }

            self.setType(data.type, true);

            function _mapData(set) {
                var d = _.map(_.clone(set.data), function (p) {
                    var np = _.clone(p);
                    if (p.hasOwnProperty('x')) {
                        np.x = o.dataFormatX(p.x);
                    }
                    if (p.hasOwnProperty('y')) {
                        np.y = o.dataFormatY(p.y);
                    }
                    return np;
                }).sort(o.sortX);
                return _.extend(_.clone(set), { data: d });
            }

            nData.main = _.map(nData.main, _mapData);
            self._mainData = nData.main;
            self._xScaleType = nData.xScale;
            self._yScaleType = nData.yScale;

            if (nData.hasOwnProperty('comp')) {
                nData.comp = _.map(nData.comp, _mapData);
                self._compData = nData.comp;
            } else {
                self._compData = [];
            }

            self._draw();
        },

        /**
         * Change the scale of an axis
         *
         * @param string axis   Name of an axis. One of 'x' or 'y'
         * @param string type   Name of the scale type
         *
         */
        setScale: function (axis, type) {
            var self = this;

            switch (axis) {
                case 'x':
                    self._xScaleType = type;
                    break;
                case 'y':
                    self._yScaleType = type;
                    break;
                default:
                    throw 'Cannot change scale of unknown axis "' + axis + '".';
            }

            self._draw();
        },

        /**
         * Create the SVG element and g container. Resize if necessary.
         */
        _drawSvg: function () {
            var self = this,
                c = self._container,
                options = self._options,
                width = parseInt(c.style('width').replace('px', ''), 10),
                height = parseInt(c.style('height').replace('px', ''), 10),
                svg,
                g,
                gScale;

            svg = c.selectAll('svg')
                .data(emptyData);

            svg.enter().append('svg')
                // Inherit the height and width from the parent element
                .attr('height', height)
                .attr('width', width)
                .attr('class', 'xchart');

            svg.transition()
                .attr('width', width)
                .attr('height', height);

            g = svg.selectAll('g')
                .data(emptyData);

            g.enter().append('g')
                .attr(
                'transform',
                'translate(' + options.paddingLeft + ',' + options.paddingTop + ')'
            );

            gScale = g.selectAll('g.scale')
                .data(emptyData);

            gScale.enter().append('g')
                .attr('class', 'scale');

            self._svg = svg;
            self._g = g;
            self._gScale = gScale;

            self._height = height - options.paddingTop - options.paddingBottom -
            options.axisPaddingTop - options.axisPaddingBottom;
            self._width = width - options.paddingLeft - options.paddingRight -
            options.axisPaddingLeft - options.axisPaddingRight;
        },

        /**
         * Resize the visualization
         */
        _resize: function (event) {
            var self = this;

            self._drawSvg();
            self._draw();
        },

        /**
         * Draw the x and y axes
         */
        _drawAxes: function () {
            if (this._noData) {
                return;
            }
            var self = this,
                o = self._options,
                t = self._gScale.transition().duration(o.timing),
                xTicks = o.tickHintX,
                yTicks = o.tickHintY,
                bottom = self._height + o.axisPaddingTop + o.axisPaddingBottom,
                zeroLine = d3.svg.line().x(function (d) { return d; }),
                zLine,
                zLinePath,
                xAxis,
                xRules,
                yAxis,
                yRules,
                labels;

            xRules = d3.svg.axis()
                .scale(self.xScale)
                .ticks(xTicks)
                .tickSize(-self._height)
                .tickFormat(o.tickFormatX)
                .orient('bottom');

            xAxis = self._gScale.selectAll('g.axisX')
                .data(emptyData);

            xAxis.enter().append('g')
                .attr('class', 'axis axisX')
                .attr('transform', 'translate(0,' + bottom + ')');

            xAxis.call(xRules);

            labels = self._gScale.selectAll('.axisX g')[0];
            if (labels.length > (self._width / 80)) {
                labels.sort(function (a, b) {
                    var r = /translate\(([^,)]+)/;
                    a = a.getAttribute('transform').match(r);
                    b = b.getAttribute('transform').match(r);
                    return parseFloat(a[1], 10) - parseFloat(b[1], 10);
                });

                d3.selectAll(labels)
                    .filter(function (d, i) {
                        return i % (Math.ceil(labels.length / xTicks) + 1);
                    })
                    .remove();
            }

            yRules = d3.svg.axis()
                .scale(self.yScale)
                .ticks(yTicks)
                .tickSize(-self._width - o.axisPaddingRight - o.axisPaddingLeft)
                .tickFormat(o.tickFormatY)
                .orient('left');

            yAxis = self._gScale.selectAll('g.axisY')
                .data(emptyData);

            yAxis.enter().append('g')
                .attr('class', 'axis axisY')
                .attr('transform', 'translate(0,0)');

            t.selectAll('g.axisY')
                .call(yRules);

            // zero line
            zLine = self._gScale.selectAll('g.axisZero')
                .data([[]]);

            zLine.enter().append('g')
                .attr('class', 'axisZero');

            zLinePath = zLine.selectAll('line')
                .data([[]]);

            zLinePath.enter().append('line')
                .attr('x1', 0)
                .attr('x2', self._width + o.axisPaddingLeft + o.axisPaddingRight)
                .attr('y1', self.yZero)
                .attr('y2', self.yZero);

            zLinePath.transition().duration(o.timing)
                .attr('y1', self.yZero)
                .attr('y2', self.yZero);
        },

        /**
         * Update the x and y scales (used when drawing)
         *
         * Optional methods in drawing types:
         *    preUpdateScale
         *    postUpdateScale
         *
         * Example implementation in vis type:
         *
         *    function postUpdateScale(self, scaleData, mainData, compData) {
   *      self.xScale2 = d3.scale.ordinal()
   *        .domain(d3.range(0, mainData.length))
   *        .rangeRoundBands([0, self.xScale.rangeBand()], 0.08);
   *    }
         *
         */
        _updateScale: function () {
            var self = this,
                _unionData = function () {
                    return _.union(self._mainData, self._compData);
                },
                scaleData = _unionData(),
                vis = self._vis,
                scale,
                min;

            delete self.xScale;
            delete self.yScale;
            delete self.yZero;

            if (vis.hasOwnProperty('preUpdateScale')) {
                vis.preUpdateScale(self, scaleData, self._mainData, self._compData);
            }

            // Just in case preUpdateScale modified
            scaleData = _unionData();
            scale = _scales.xy(self, scaleData, self._xScaleType, self._yScaleType);

            self.xScale = scale.x;
            self.yScale = scale.y;

            min = self.yScale.domain()[0];
            self.yZero = (min > 0) ? self.yScale(min) : self.yScale(0);

            if (vis.hasOwnProperty('postUpdateScale')) {
                vis.postUpdateScale(self, scaleData, self._mainData, self._compData);
            }
        },

        /**
         * Create (Enter) the elements for the vis
         *
         * Required method
         *
         * Example implementation in vis type:
         *
         *    function enter(self, data, callbacks) {
   *      var foo = self._g.selectAll('g.foobar')
   *        .data(data);
   *      foo.enter().append('g')
   *        .attr('class', 'foobar');
   *      self.foo = foo;
   *    }
         */
        _enter: function (vis, storage, data, className) {
            var self = this,
                callbacks = {
                    click: self._options.click,
                    mouseover: self._options.mouseover,
                    mouseout: self._options.mouseout
                };
            self._checkVisMethod(vis, 'enter');
            vis.enter(self, storage, className, data, callbacks);
        },

        /**
         * Update the elements opened by the select method
         *
         * Required method
         *
         * Example implementation in vis type:
         *
         *    function update(self, timing) {
   *      self.bars.transition().duration(timing)
   *        .attr('width', self.xScale2.rangeBand())
   *        .attr('height', function (d) {
   *          return self.yScale(d.y);
   *        });
   *    }
         */
        _update: function (vis, storage) {
            var self = this;
            self._checkVisMethod(vis, 'update');
            vis.update(self, storage, self._options.timing);
        },

        /**
         * Remove or transition out the elements that no longer have data
         *
         * Required method
         *
         * Example implementation in vis type:
         *
         *    function exit(self) {
   *      self.bars.exit().remove();
   *    }
         */
        _exit: function (vis, storage) {
            var self = this;
            self._checkVisMethod(vis, 'exit');
            vis.exit(self, storage, self._options.timing);
        },

        /**
         * Destroy the current vis type (transition to new type)
         *
         * Required method
         *
         * Example implementation in vis type:
         *
         *    function destroy(self, timing) {
   *      self.bars.transition().duration(timing)
   *        attr('height', 0);
   *      delete self.bars;
   *    }
         */
        _destroy: function (vis, storage) {
            var self = this;
            self._checkVisMethod(vis, 'destroy');
            try {
                vis.destroy(self, storage, self._options.timing);
            } catch (e) {}
        },

        /**
         * Draw the visualization
         */
        _draw: function () {
            var self = this,
                o = self._options,
                comp,
                compKeys;

            self._noData = _.flatten(_.pluck(self._mainData, 'data')
                .concat(_.pluck(self._compData, 'data'))).length === 0;

            self._updateScale();
            self._drawAxes();

            self._enter(self._vis, self._mainStorage, self._mainData, '.main');
            self._exit(self._vis, self._mainStorage);
            self._update(self._vis, self._mainStorage);

            comp = _.chain(self._compData).groupBy(function (d) {
                return d.type;
            });
            compKeys = comp.keys();

            // Find old comp vis items and remove any that no longer exist
            _.each(self._compStorage, function (d, key) {
                if (-1 === compKeys.indexOf(key).value()) {
                    var vis = _vis[key];
                    self._enter(vis, d, [], '.comp.' + key.replace(/\W+/g, ''));
                    self._exit(vis, d);
                }
            });

            comp.each(function (d, key) {
                var vis = _vis[key], storage;
                if (!self._compStorage.hasOwnProperty(key)) {
                    self._compStorage[key] = {};
                }
                storage = self._compStorage[key];
                self._enter(vis, storage, d, '.comp.' + key.replace(/\W+/g, ''));
                self._exit(vis, storage);
                self._update(vis, storage);
            });

            if (self._noData) {
                o.empty(self, self._selector, self._mainData);
            } else {
                o.notempty(self, self._selector);
            }
        },

        /**
         * Ensure drawing method exists
         */
        _checkVisMethod: function (vis, method) {
            var self = this;
            if (!vis[method]) {
                throw 'Required method "' + method + '" not found on vis type "' +
                self._type + '".';
            }
        }
    });
    if (typeof define === 'function' && define.amd && typeof define.amd === 'object') {
        define(function () {
            return xChart;
        });
        return;
    }

    window.xChart = xChart;

}());
